TW503385B - Gray scale display reference voltage generating circuit capable of changing gamma correction characteristic and LCD drive unit employing the same - Google Patents
Gray scale display reference voltage generating circuit capable of changing gamma correction characteristic and LCD drive unit employing the same Download PDFInfo
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- TW503385B TW503385B TW089126226A TW89126226A TW503385B TW 503385 B TW503385 B TW 503385B TW 089126226 A TW089126226 A TW 089126226A TW 89126226 A TW89126226 A TW 89126226A TW 503385 B TW503385 B TW 503385B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0606—Manual adjustment
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Liquid Crystal (AREA)
Abstract
Description
503385 A7 ____________ B7 _-……"……丨__…丨_丨丨……丨 — 五、發明說明(1 ) 發明背景 本發明係有關一種用於LCD(液晶顯示器)驅動單元等之 灰階顯示參考電壓產生電路以及關於採用該電路至LCD驅 動單元❹ 前逑灰階顯示參考電壓產生電路爲一種介於二電壓間形 成中間電壓的電路0例如於主動矩陣系統LCD裝置之 LCO驅動區段等,中間電壓係經由電阻劃分形成。然後電 阻劃分用電阻器具有一種稱作伽瑪(7〇校正之電阻比,以及 根據此一電阻比,液晶材料光學特徵經修正而提供更爲自 然灰階顯示。 以下將參照設置有前述灰階顯示參考電壓產生電路之 LCD裝置之構造、LCD裝置之TFT(薄膜電晶體)型lcd 面板之構造、LCD驅動波形以及LCD面板之來源驅動器作 説明。 經濟部智慧財產局員工消費合作社印製 圖6顯示TFT系統LCD作爲主動鉅陣系統之代表例之 方塊圖。此種LCD裝置被分成LCD區段以及驅動[Co區 段之LCD驅動電路(LCD驅動區段)。前述lcd驅動區段 具有TFT系統LCD面板1。LCD面板i係與Lcd元件 (圖中未顯示)以及一對電極(公用電極)2整合一體設置,容 後詳述。 他方面,LCD驅動電路包括源極驅動器總成3、一門極 驅動器總成4及一控制器5,係由ICs(積體電路)以及LCD 驅動電源供應器6组成。控制器5將顯示資料^以及#制 信號S1輸入源極驅動器總成3,以及將垂直同步作號2輸 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) 503385 A7 B7 ________^--*---—- 五、發明說明(2 ) 入閘極驅動器誠4 ,水平同步錢輸人源極驅動 器總成3以及閘極驅動器總成4 ° 前述構造中,外部輸入資料透過控制器5輸人源極驅動 器總成3作錢示資料D,其錄位信號。然後源極驅動 器總成3分時劃分被輸入顯1^資料〇 ’經由第n個源極驅 動器將資料鎖成至第4神動器,以及隨後與由控制器5 輸入的水刊步信«步將被關的資料進行D/A(數位至 類比)轉換。然後經由將分時劃分顯示資料D接受D/A轉 換而形成的灰階顯示器使用類比電壓(後文稱作灰階顯示器 電壓)透過源極信號線(圖中未顯示)輸出至LCD面板1内側 的LCD元件。 圖7顯示LCD面板1之構造。LCD面板具有像素電極 11,像素電容器12,TFTsl3用以控制欲施加於像素電極 11之電壓的開及關,源極信號線14,閘極信號線15以及 對電極16(對應於圖6之對電極2)。此案例中,一像素之 LCD元件A係由像素電極11,像素電容器12,TFTsl3 組成。 經濟部智慧財產局員工消費合作社印製 imll[IIII * I I {請先閱讀背面之注意事項再本頁) .線 前述對應於欲用於顯示的像素免度之灰階顯示電壓由國6 之源極驅動器總成3施加至源極信號線14。他方面,連續 導通排列於行方向之TFTsl3之掃描信號由閘極驅動器總 成4施加至閘極信號線15。然後透過各個處於導通態的 TFTS13,源極信號線i4之灰階顯示電壓施加至連結至 TFTsl3之汲極的像素電極11,以及電荷積聚於設置於像 素電極與對電極16間的像素電容器12。如此液晶的光透 -5 - ^紙張尺度適用中國國(CNS)A4規格(210X 297公' 503385 Α7 Β7 五、發明說明( 3 經濟部智慧財產局員工消費合作社印製 視比隨灰階顯示電壓改變,俾執行像素顯示。 圖8及圖9顯示LCD驅動波形之—例。冑8及圖中,參 考編號2…5表示源極驅動器總成3之一源極驅動器的 驅動波形,而參考編號22及26表示閘極驅動器總成4之 一閘極驅動器的驅動波形。參考編號23及27表示對電極 16之電位,而參考編號24及28表示像素電極u之電壓 波形β此例中,施加至液晶材料之電壓爲像素電極u與對 電極16間的電位差,且於圖中以影線表示。 例如於圖8之例,TFTS13唯有於閘極驅動器之驅動波形 22之位置係於Η位準時才被導通,藉此源極驅動器之驅動 波形21與對電極16之電位23間之差異電壓施加至像素電 極11。隨後,閘極驅動器之驅動波形22之位置變成L位 準,藉此TFTsl3被斷開。此種情況下由於對像素設置像 素電容器12,故保有前述電壓。 相同情沉可見於圖9之例。需注意圖8及圖9分別顯示 不同電壓施加至液晶材料之例。於圖8之例,施加電壓係 高於圖9之施加電壓。如前述,經由變更呈類比電壓至液 晶材料電壓,液晶之光透射比係以類比方式改變,提供多 位準灰階顯示。需注意可供顯示的灰階位準數係依據欲選 擇性施壓至液晶材料的類比電壓數目決定。 圖10顯示組成圖6之源極驅動器總成3之一部份之第η 個源極驅動器之一例之方塊圈。輸入的數位信號之顯示資 料D具有R(紅)、G(綠)及Β(藍)之顯示資料(DR,DG, DB)。然後顯示資料D —旦閂鎖於輸入閂鎖電路31以及隨 -6- 本紙張尺度適用中國國家標準(CNS)A4規袼(210 X 297公复) ί請先閱讀背面之注意事項再網寫本頁) .¾ 訂· •線. 503385503385 A7 ____________ B7 _- …… " …… 丨 __… 丨 _ 丨 丨 …… 丨 —— V. Description of the invention (1) Background of the invention The present invention relates to a kind of ash for LCD (liquid crystal display) drive units and the like. Step display reference voltage generating circuit and the use of the circuit to the LCD driving unit. The front gray scale display reference voltage generating circuit is a circuit that forms an intermediate voltage between two voltages. 0 For example, in the LCO driving section of an active matrix system LCD device. Etc., the intermediate voltage is formed by resistance division. The resistor for resistance division then has a resistance ratio called gamma (70 ° correction), and based on this resistance ratio, the optical characteristics of the liquid crystal material are modified to provide a more natural grayscale display. The following grayscale settings are referred to below The structure of the LCD device displaying the reference voltage generating circuit, the structure of the TFT (thin film transistor) type LCD panel of the LCD device, the LCD driving waveforms, and the source driver of the LCD panel will be explained. A block diagram showing a TFT system LCD as a representative example of an active matrix system. This type of LCD device is divided into an LCD section and an LCD drive circuit (LCD drive section) that drives the [Co section. The aforementioned LCD drive section has a TFT system LCD panel 1. The LCD panel i is integrated with an LCD device (not shown) and a pair of electrodes (common electrodes) 2. It will be described in detail later. In other aspects, the LCD drive circuit includes a source driver assembly 3 and a door. The pole driver assembly 4 and a controller 5 are composed of ICs (Integrated Circuits) and an LCD drive power supply 6. The controller 5 will display data ^ and # 制 信号S1 input source driver assembly 3, and the vertical synchronization as the number 2 input This paper size is applicable to China National Standard (CNS) A4 specifications (210 X 297 mm) 503385 A7 B7 ________ ^-* ----- 5 、 Explanation of invention (2) Gate driver driver 4, horizontal synchronous input to human source driver assembly 3 and gate driver assembly 4 ° In the aforementioned structure, external input data is input to the human source driver assembly through the controller 5. 3 Make the money display data D, its recording signal. Then the source driver assembly is divided into 3 minutes and input 1 ^ data 0 'to lock the data to the 4th magic machine via the nth source driver, and then D / A (digital-to-analog) conversion of the data to be related to the water step message input by the controller 5. Then use the gray-scale display formed by converting the time-division display data D to D / A conversion The analog voltage (hereinafter referred to as the gray-scale display voltage) is output to the LCD element inside the LCD panel 1 through a source signal line (not shown). Figure 7 shows the structure of the LCD panel 1. The LCD panel has pixel electrodes 11, pixels Capacitor 12, TFTsl3 is used to control the application The voltage of the pixel electrode 11 is turned on and off, the source signal line 14, the gate signal line 15 and the counter electrode 16 (corresponding to the counter electrode 2 in FIG. 6). In this case, a pixel LCD element A is composed of a pixel electrode 11, pixel capacitor 12, TFTsl3. Imll printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs [IIII * II {Please read the precautions on the back before this page). The foregoing line corresponds to the pixel exemption for display. The gray-scale display voltage is applied to the source signal line 14 by the source driver assembly 3 of the country 6. On the other hand, the scanning signal that continuously turns on the TFTsl3 arranged in the row direction is applied to the gate signal line 15 by the gate driver assembly 4. Then, through each of the TFTs 13 in the on state, the gray-scale display voltage of the source signal line i4 is applied to the pixel electrode 11 connected to the drain of the TFTs 13 and the charge is accumulated in the pixel capacitor 12 provided between the pixel electrode and the counter electrode 16. So the light transmission of the liquid crystal is -5-^ Paper size applies to China (CNS) A4 specifications (210X 297 male '503385 Α7 Β7 V. Description of the invention (3 Intellectual Property Bureau, Ministry of Economic Affairs, Employee Consumer Cooperative, printed visual ratio with gray scale display voltage) To change, 俾 perform pixel display. Figure 8 and Figure 9 show examples of LCD drive waveforms. 胄 8 and Figures, reference numbers 2 ... 5 indicate the source driver drive waveforms of one of the source driver assemblies 3, and the reference number 22 and 26 indicate driving waveforms of one of the gate driver assemblies 4. The reference numbers 23 and 27 indicate the potential of the counter electrode 16 and the reference numbers 24 and 28 indicate the voltage waveform β of the pixel electrode u. In this example, apply The voltage to the liquid crystal material is the potential difference between the pixel electrode u and the counter electrode 16 and is indicated by hatching in the figure. For example, in the example of FIG. 8, the position of the driving waveform 22 of the TTFT 13 only at the gate driver is in the niche. It is turned on on time, whereby the difference voltage between the driving waveform 21 of the source driver and the potential 23 of the counter electrode 16 is applied to the pixel electrode 11. Then, the position of the driving waveform 22 of the gate driver becomes L level, thereby the TFTsl 3 is disconnected. In this case, the pixel capacitor 12 is provided for the pixel, so the aforementioned voltage is maintained. The same symptom can be seen in the example of FIG. 9. Note that FIG. 8 and FIG. 9 respectively show examples of applying different voltages to the liquid crystal material. In the example of Fig. 8, the applied voltage is higher than the applied voltage of Fig. 9. As mentioned above, by changing the analog voltage to the voltage of the liquid crystal material, the light transmittance of the liquid crystal is changed analogously to provide a multi-level quasi-gray scale display. Note that the number of gray levels that can be displayed is determined by the number of analog voltages to be selectively applied to the liquid crystal material. Figure 10 shows the n-th source driver that forms part of the source driver assembly 3 of Figure 6 An example is the square circle. The display data D of the input digital signal has R (red), G (green), and B (blue) display data (DR, DG, DB). Then display data D-once latched on the input The latch circuit 31 and the following -6- This paper size applies the Chinese National Standard (CNS) A4 regulations (210 X 297 public reply). Please read the precautions on the back before writing this page on the Internet.) 503385
發明說明d 後根據位移暫存器η之操作而分時 Γ::暫存器執行藉控制器5供應的開始脈衝二ί 脈CK執仃位移。隨後,資料基於由控制器 時 =(圖中未顯示)而集合移轉至維持記憶體:ί: 意參考數母S表巧義ά。 & 34 “ 電壓產生電路Μ基於由外轉考電恩產生 電路(對應於目6〈 LCD義電源6敗 生於各位準之-參考電壓。於維持記憶體34 準位移器35傳輸至D/A轉換器電路(數位至類二= 路)36’錢基於來自灰階顯轉考電壓產生電路μ於 位準參考電路而被轉成類比電壓。騎類比電壓由[CD 動祕輸出端予38藉輸出電路37被輸出至lcd元件A 的源極信號線14作爲前述灰階顯示電壓。換言之,參考電 壓位準數目變成可供顯示的灰階位準數目。 私 圖11顯示前述可產生中間電壓用以輸出多個參考電壓之 灰階顯示參考電壓產生電路39之構造。需注意_ U之灰 階顯示參考電壓產生電路39產生64個參考電壓位準。 經濟部智慧財產局員工消費合作社印製 此種灰階顯示參考電壓產生電路39係由九個灰階電壓輸 出端子组成,端子分別以V0,V8,Vl6,V24mK(K V48, V56及V64指示;電阻器元件R〇至R7具有伽瑪校 正之電阻比以及共64個電阻器(圖中未顯示),64個電阻器 分成八組串聯連結跨電阻器元件R0至R7之二終端。如前 述,稱作伽瑪校正之電阻比内建於源接驅動器,提供LCD 驅動輸出電壓用於轉換成具有線圖特徵的灰階顯示電壓。 7- 本紙張尺度適用中國國家標準(CNS>A4規袼(210 X 297公釐) 503385Description of the invention After d, time-sharing is performed according to the operation of the displacement register η Γ :: The register performs the start pulse 2 supplied by the controller 5 and the pulse CK performs displacement. Subsequently, the data is transferred to the maintenance memory based on the time when the controller = (not shown in the figure): ί: Refer to the number S table. & 34 "The voltage generating circuit M is based on the externally generated test circuit (corresponding to head 6 <LCD sense power supply 6 was defeated by each of you-reference voltage. In the maintenance memory 34, the quasi-shifter 35 is transmitted to D / A converter circuit (digital to class two = circuit) 36 'money is converted to analog voltage based on the gray reference display voltage generation circuit μ to the level reference circuit. The analog voltage is set by the [CD ### The output circuit 37 is output to the source signal line 14 of the LCD element A as the aforementioned grayscale display voltage. In other words, the number of reference voltage levels becomes the number of grayscale levels available for display. Private figure 11 shows that the aforementioned intermediate voltage can be generated Gray scale display reference voltage generating circuit 39 for outputting multiple reference voltages. Note that _ U gray scale display reference voltage generating circuit 39 generates 64 reference voltage levels. Printed by the Consumer Cooperative of Intellectual Property Bureau, Ministry of Economic Affairs This gray-scale display reference voltage generating circuit 39 is composed of nine gray-scale voltage output terminals, which are respectively indicated by V0, V8, V16, V24mK (K V48, V56, and V64; resistor elements R0 to R7 have gamma Of correction Resistance ratio and a total of 64 resistors (not shown in the figure), the 64 resistors are divided into eight groups connected in series across the two ends of the resistor elements R0 to R7. As mentioned above, the resistance ratio called gamma correction is built in the source Connected to the driver to provide LCD drive output voltage for conversion to gray-scale display voltage with line graph characteristics. 7- This paper size applies Chinese National Standard (CNS > A4 Regulation (210 X 297 mm) 503385
發明說明( 因此藉前述電阻比校正液晶材料 液晶材料之光學特性之自然灰階顯示:習1灰== 電絲特徵之—例 但則述i知灰階顯示參考電壓產生 ==的伽瑪校正特徵(如圖12所示二:出 電壓的線_特徵)佩液騎料類型錢LCD聽像素i 二個LCD模組而異。然後於源極驅動器之設計 期間決#驅動¥之内建灰_轉考電壓產生電路39 之電阻劃分比。因此當根據所採用的液晶材料類型以及 LCD面紅像素數目較伽瑪校正特徵時,有需要依各種 情況重新製作源極驅動器的問題。 可考慮-種提財考調絲置之方法,該調整裝置 係用以調整由外部參考電壓產生電路供給的多階灰階顯示 參考電壓產生電路至灰階電壓輸入端子V〇至V64,以及藉 參考電壓調整裝置調整欲供給灰階電壓輸入端子V0至V64 之中間電壓β但設置參考電壓調整裝置促成端子數目及電 路尺寸的加大,結果導致製造成本的升高。 發明概述 經濟部智慧財產局員工消費合作社印製 如此本發明之一目的係提供一種可根據液晶材料及LCD 面板特徵改變伽瑪校正特徵而未增加製造成本之一種灰階 顯示參考電壓產生電路,以及採用該電路之LCD驅動單 元 爲了達成前述目的,根據本發明之第一特徵方面提供一 種灰階顯示參考電壓產生電路,用以產生灰階顯示用之參 8- 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) 503385 A7 B7___ 五、發明說明(6 ) 考電壓而用於將顯示資料由數位形式轉成類比形式,該電 路包括:一參考電壓產生電路,用以產生多數位準之參考 電壓;以及 調整電路,用以基於外部調整資料調整參考電壓。 根據前述構造,由參考電壓產生電路產生的多個位準的 參考電壓各自係藉調整電路基於外部調整資料作調整。因 此即使於LCD驅動單元安裝以灰階顯示參考電壓產生電路 後,參考電壓可藉外部供給調整資料單純根據液晶材料以 及LCD面板特徵調整而無須重新製作LCD驅動單元。 一具體實施例中,各該調整電路包括·· 一參考電壓之輸入端子;一調整資料之輸入端子;一調 整後電壓之輸出端子;以及一調整後電壓產生電路,其根 據調整資料產生比參考電壓更高的電壓或比參考電壓更低 的電壓以及輸出如此所得的電壓作爲調整後的電壓。 根據前述構造,由輸入端子輸入的比參考電壓更高或更 低的電壓係藉調整電壓產生電路根據調整資料而產生,以 及由輸出端子輸出作爲調整後電壓。 此外於一具體實施例中,調整後的電壓產生電路包含: 經濟部智慧財產局員Η消費合作社印製 • i - ! ·丨 — 丨 · ί {請先閱讀背面之注意事項寫本頁) 一電位差產生的電路,用於根據調整資料產生的電位 差;以及 一和電壓輸出電路用於輸出參考電壓與電位差的和電 壓, 來自和電壓輸出電路的和電壓係被輸出作爲調整後電 壓。 -9- 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) 503385 A7 B7 五、發明說明(7) 經濟部智慧財產局員Η消費合作社印製 根據前述構造,對應於調整資料之電位差係由電位差產 生電路產生。然後電位差與參考電壓之和電壓係由和電壓 輸出電路產生且輸出作為調整後電壓。 此外,於一具體實施例中,調整後的電壓產生電路包含: 一電阻器元件,其係設置於輸入端子與輸出端子間,且 產生對應於流經電阻器元件之電流值之電位差; 至少一恆定電流電源;以及 至少一開關元件,其係基於調整資料被導通及斷開,以 及插置於恆定電流電源與電阻器元件間, 電位差係經由基於調整資料藉各開關元件的導通及斷開 控制而改變流經電阻器元件之電流值而改變電位差。 根據前述構造,當各個插置於恆定電流來源與電阻器元 件間之開關元件係基於調整資料被控制成導通及斷開時, 流經插置於輸入端子與輸出端子間之電阻器元件之電流值 改變。結果跨電阻器元件之二端子產生的電位差改變因而 以對應於調整資料之調整數量調整參考電壓且輸出作為調 整後的電壓。 此外,一具體實施例包括一缓衝放大器插置於電阻器元 件與輸出端子間。 根據前述構造,輸出阻抗係經由插置於電阻器元件與輸 出端子間的缓衝放大器而減少,藉此由輸出端子穩定取出 輸出電流。 此外,於一具體實施例中,恆定電流來源產生以2(η·υ加 權的電流,假設為η正整數,以及 -10- 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) 請 先 閱 讀 背 面 之 注 意 事 項 再 頁i 訂 ·> 503385 經濟部智慧財產局員工消費合作社印製 A7 B7五、發明說明(8 ) 調整資料為以2的補數表示式表示的二進制位數者多位 元數位資料。 根據前述構造,經由設定調整資料的位元數目為η,恆定 電流來源之調整資料以及權值可變成彼此相對應,以及對 應於調整資料之乘數電位差係跨電阻器元件之二終端產 生。 此外,於一具體實施例中,恆定電流來源係由下列組 成:至少一第一恆定電流來源用於將電流流入電阻器元 件,及至少一第二恆定電流來源用於讓電流流出,以及 開關元件中之至少一者可讓電流由第一恆定電流來源流 入電阻器元件,以及開關元件之另一者可讓電流由電阻器 元件流出而流至第二恆定電流來源。 根據前述構造,若各開關元件係控制成基於調整資料可 導通及斷開,則將電流流經電阻器元件之第一恆定電流來 源以及電流流出電阻器元件之第二恆定電流來源被設定。 如此調整量及參考電壓之增減係根據調整資料而設定。 此外,於一具體實施例中,參考電壓產生電路產生伽瑪 校正後的參考電壓,以及 調整電路為伽瑪校正調整電路用於調整伽瑪校正參考電 歷。 根據前述構造,已經經過伽瑪校正的參考電壓進一步根 據液晶材料以及LCD面板特徵調整。因此可產生更正確對 液晶材料以及LCD面板特徵作調整的參考電壓。 根據本發明之第二特徵方面,提供一種LCD驅動單元, -11 - (請先閱讀背面之注意事項再本頁)Explanation of the invention (so the natural grayscale display of the optical characteristics of the liquid crystal material is corrected by the aforementioned resistance ratio: Xi 1 gray == one of the characteristics of the wire-for example, but the gray scale display reference voltage generation == gamma correction Features (as shown in Figure 12: Output voltage line_features) The type of liquid-filled LCD LCD listening pixels varies between the two LCD modules. Then, during the design of the source driver, it is determined to # Drive ¥ within the built-in gray _Refer to the resistance division ratio of the voltage generation circuit 39. Therefore, according to the type of liquid crystal material used and the number of red pixels on the LCD surface, which are more gamma-corrected, there is a problem that the source driver needs to be remade according to various situations. Consider- A method for adjusting money by adjusting money, the adjusting device is used for adjusting the multi-level gray-scale display reference voltage generating circuit provided by an external reference voltage generating circuit to the gray-scale voltage input terminals V0 to V64, and adjusting by reference voltage The device adjusts the intermediate voltage β to be supplied to the gray-scale voltage input terminals V0 to V64, but the reference voltage adjustment device is set to increase the number of terminals and the circuit size, resulting in an increase in manufacturing costs. SUMMARY OF THE INVENTION Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economics. One of the purposes of the present invention is to provide a grayscale display reference voltage generating circuit that can change the gamma correction characteristics according to the characteristics of liquid crystal materials and LCD panels without increasing manufacturing costs, and In order to achieve the foregoing object, the LCD driving unit adopting the circuit provides a gray-scale display reference voltage generating circuit according to the first characteristic aspect of the present invention for generating gray-scale display parameters. 8-This paper standard is applicable to the Chinese National Standard (CNS ) A4 specification (210 X 297 mm) 503385 A7 B7___ 5. Description of the invention (6) It is used to convert the display data from digital form to analog form based on the voltage test. The circuit includes: a reference voltage generating circuit for generating multiple Digital reference voltage; and an adjustment circuit for adjusting the reference voltage based on external adjustment data. According to the aforementioned structure, the multiple reference voltages generated by the reference voltage generating circuit are adjusted by the adjustment circuit based on the external adjustment data. Therefore, even if the LCD drive unit is installed, the reference voltage is displayed in grayscale. After the circuit is generated, the reference voltage can be adjusted based on the characteristics of the liquid crystal material and the LCD panel by externally supplied adjustment data without the need to remake the LCD drive unit. In a specific embodiment, each of the adjustment circuits includes a reference voltage input terminal; An input terminal for adjusting data; an output terminal for adjusting the voltage; and an adjusted voltage generating circuit that generates a voltage higher than the reference voltage or a voltage lower than the reference voltage based on the adjustment data and outputs the voltage thus obtained as adjustment According to the foregoing configuration, a voltage higher or lower than a reference voltage input from an input terminal is generated by an adjustment voltage generating circuit according to adjustment data, and is output by an output terminal as an adjusted voltage. In addition, a specific implementation In the example, the adjusted voltage generating circuit contains: Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and the Consumer Cooperative • i-! · 丨 — 丨 · ί {Please read the precautions on the back first and write this page) A circuit that generates a potential difference, using The potential difference based on the adjustment data; and a voltage output The circuit is used to output the sum voltage of the reference voltage and the potential difference. The sum voltage from the sum voltage output circuit is output as the adjusted voltage. -9- This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) 503385 A7 B7 V. Description of the invention (7) Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and the Consumer Cooperative, according to the aforementioned structure, corresponding to the adjustment data The potential difference is generated by a potential difference generating circuit. The sum of the potential difference and the reference voltage is generated by the sum voltage output circuit and the output is used as the adjusted voltage. In addition, in a specific embodiment, the adjusted voltage generating circuit includes: a resistor element disposed between the input terminal and the output terminal, and generating a potential difference corresponding to a current value flowing through the resistor element; at least one A constant current power source; and at least one switching element that is turned on and off based on the adjustment data, and is inserted between the constant current power source and the resistor element, and the potential difference is controlled by the on and off of each switching element based on the adjustment data Changing the value of the current flowing through the resistor element changes the potential difference. According to the foregoing configuration, when each switching element interposed between the constant current source and the resistor element is controlled to be turned on and off based on the adjustment data, the current flowing through the resistor element interposed between the input terminal and the output terminal The value changes. As a result, the potential difference generated across the two terminals of the resistor element is changed, so the reference voltage is adjusted by the adjustment amount corresponding to the adjustment data and the output is used as the adjusted voltage. In addition, a specific embodiment includes a buffer amplifier interposed between the resistor element and the output terminal. According to the foregoing configuration, the output impedance is reduced by the buffer amplifier inserted between the resistor element and the output terminal, thereby stably extracting the output current from the output terminal. In addition, in a specific embodiment, the constant current source generates a current weighted by 2 (η · υ, assuming a positive integer η, and -10- this paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (%) Please read the notes on the back before ordering. ≫ 503385 Printed by the Consumers' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (8) Adjust the data to binary digits represented by two's complement expression According to the foregoing structure, by setting the number of bits of the adjustment data to η, the adjustment data and weights of the constant current source can become corresponding to each other, and the multiplier potential difference corresponding to the adjustment data is a trans resistance. In addition, in a specific embodiment, the constant current source is composed of the following: at least one first constant current source is used for flowing current into the resistor element, and at least one second constant current source is used for Allowing current to flow, and at least one of the switching elements allows current to flow from the first constant current source into the resistor element and the switching element According to the aforementioned configuration, if each switching element is controlled to be turned on and off based on the adjustment data, a current is passed through the resistor element according to the aforementioned configuration. The first constant current source and the second constant current source of the current flowing out of the resistor element are set. The adjustment amount and the increase or decrease of the reference voltage are set according to the adjustment data. In addition, in a specific embodiment, the reference voltage generating circuit The gamma-corrected reference voltage is generated, and the adjustment circuit is a gamma-corrected adjustment circuit for adjusting the gamma-corrected reference calendar. According to the foregoing configuration, the gamma-corrected reference voltage is further adjusted according to the characteristics of the liquid crystal material and the LCD panel. Therefore, a reference voltage for more accurately adjusting the characteristics of the liquid crystal material and the LCD panel can be generated. According to the second characteristic aspect of the present invention, an LCD driving unit is provided, -11-(Please read the precautions on the back before this page)
I 線 ¥ 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) 503385 A7 B7_ 五、發明說明(9 ) 包含灰階顯示參考電壓產生電路。 (請先M讀背面之注意事項再^寫本頁) 根據前述構造,灰階顯示參考電壓產生電路可基於調整 資料調整由參考電壓產生電路產生的多個參考電壓位準中 之各個位置。因此經由外部供給調整資料,單純根據液晶 材料以及LCD面板特徵作調整而無需重新製成LCD驅動 單7G 0 圖式之簡單説明 由後文詳細説明及附圖將更完整了解本發明,詳細説明 及附圖僅供舉例説明之用而非限制性,附圖中: 圈1爲方塊圈顯示本發明之灰階顯示參考電壓產生電 路; 圖2爲國1之伽瑪校正調整電壓之示意方塊圈·, 圖3Α及3Β爲獲得比參考電壓更高的輸出電壓時以及獲 得比參考電壓更低的輸出電壓時之恆定電流來源之操作之 説明; 線. 圖4爲略圖顯示於伽瑪校正調整電壓之恆定電流來源區 段之電路構造; 經濟部智慧財產局員工消費合作社印製 圖5爲線圈顯示圖1顯示灰階顯示參考電壓產生電路之 LCD驅動輸出電壓特徵; 圖6爲方塊圖顯示TFT系統LCD裝置; 圖7爲略圖顯示圖6之LCD面板構造; 圖8爲圖表顯示LCD驅動波形之一例; 圈9爲圈表顯示當施加電壓係低於圖8時之LCD驅動波 形; -12- 本紙張尺度適用中國國家標準(CNS)A4規格⑽X 297公釐) 503385 A7 五、發明說明( 10 經濟部智慧財產局員工消費合作社印製 圖10爲國6之來源驅動器之方塊國; 圖11爲略圖顯示於圖10之灰階顯示參考電麼產生電路 之構造;以及 圖I2爲線圖顯示圖11所承灰階顯示參考電壓產生電路 之LCD驅動輸出電壓特徵之一例。 較隹具體實施例之詳細説明 基於附圖所示具體實施例説明本發明之細節如後°圖1 爲方塊圖顯示本具體實施例之灰階顯示參考電壓產生電路 之構造。此種灰階顯示參考電歷產生電路特別可用於主動 矩陣系統LCD裝置之LCD #動電路。需注意内建有本發 明之灰階顯示參考電壓產生電路之LCD裝置,LCD裝置之 LCD面板之構造,LCD驅動波形以及LCD面板之源極驅 動器之構造皆係以參照圖6至圖10所述之LCD裝置構 造、LCD面板構造、LCD驅動波形及源極驅動器構造完全 相同,因此不再於此處説明。 本具體實施例之灰階顯示參考電壓產生電路41形成64 位準參考電壓,以及產生類似圖11所示習知灰階顯示參考 電壓產生電路39之中間電壓。 本具體實施例之灰階顯示參考電壓產生電路41包括最高 電壓輸入端子V0及最低電壓輸入端子V64之二電壓輸入 端子,八個電阻器元件R0至R7具有電阻器比其二爲二二 伽瑪校正之參考値,伽瑪(γ)校正調整電路42用以 : 下精密調整由電阻器元件R0至R7產生 I " $向參考電壓,於规定範,…資=::= -13 本紙張尺度翻中國國家標準(CNS)A4規格(21G X 297 ^^7* (請先閱讀背面之注意事項本頁) 裝 -ιδτ· 訾 -線 503385 A7 五、發明說明(11 ) 鎖於微調期間由伽瑪校正調整電路42使用的調整資料。你 阻器7L件R0至R7組成參考電壓產生電路。進一步共有^ 電阻器(圖中未顯示),分成八組串聯連結於跨最上方伽= 正調整電路42之最高電壓輸入端子v〇及輸出端子,跨= 間:瑪校正調整電路42之輸出端子以及跨最低伽瑪校正 整電路42之輸出端子與最低電壓輸出端子v64。 使用前述構造,無須設置九個灰階電壓輸出端子v〇至 V64不似圖u所示習知灰階顯示參考電壓產生電路39 於灰階顯示參考電壓產生電路41產生中間電壓且可作 圖2爲7F意方塊國顯示伽瑪校正調整電路之告。 瑪校,整電路42係由-電阻器元件R用以產生電壓伽 一恆疋電流來源44及45以及一缓衝放大器46組 奴 流經電阻器元件R引起的電壓降,輪出電壓: 輸入電壓向上或向下位移達—蚊電壓而予調整。二 述構造之伽瑪校正調整電路42操作如下。 /、則 經濟部智慧財產局員工消費合作社印製 :言之例如作爲參考値之電壓_供給伽碼 路42心輸出端子ο。當獲得比參考電壓整宅 2出電壓時’流經電阻器元件R之電流Μ::。 祿)隨缺電流來源4 4及4 5改變,經由⑽電 不 R引起的電壓降,經由將輸人電㈣上 疋科 ^而於電阻器元件W騎㈣壓VGut^;;=4= 換言之電壓係藉伽瑪校正調整電路42調整,故當獲得赛 -14- 本紙張尺度適用中國a^^(CNS〉A4 ϋ— χ挪公 503385 A7 B7 五、發明說明(12) 經濟部智慧財產局員工消費合作社邱製 出電壓rVout係高於參考電壓Vref時維持方程式: Vout = Vref +i.R 以及當輸出電壓Vout係低於參考電壓Vref時維持方程 式: Vout = Vref - i.R 當獲得輸出電壓Vout係高於參考電壓Vref(圈3A)時以 及當獲得輸出電壓Vout係低於參考電壓Vref(圖3B)時, 經由操作恆定電流來源44及45改變流經電阻器元件R之 電流之狀態。上例中,如圈3 A所示,經由將位在於輸出端 子48該側之恆定電流來源45連接至電流源,於正向方向 由恆定電流來源45指向恆定電流來源44之電流i流經電 阻器元件R。結果當參考電壓Vref由輸入端子47輸入 時,來自輸出端子48之輸出電壓Vout變成具有下式表示 之電壓: Vout = Vref +i.R 該電壓係高於參考電壓Vref達電阻器元件R之電壓降。 與前述相反,如圖3B所示,經由連結恆定電流來源44 至電源以及將恆定電流來源45接地,由恆定電流來源44 至恆定電流來源45於負向取向的電流i流經電阻器元件 R。結果當參考電壓Vref係由輸入端子47輸入時,來自輸 出端子48之輸出電壓Vout變成具有下式表示之電壓: Vout = Vref - i.R 該電壓係低於參考電壓Vref達電阻器元件R之電壓降° 然後就個別伽瑪校正調整電路42之恆定電流來源44及 15- 本紙張尺度適用中國國家標準(CNS)A4規袼(210 X 297公釐) 請 先 閱 讀 背 之 注 意 項 再 1¾ 頁i 訂 A7 五、發明說明(13 45而言,經 經濟部智慧財產局員工消費合作社印製 交換,以及値介於#値岐換,讓接地與電源間 述交換操資料閃鎖電路43之資料控制前 後的電壓。如:=Γ器元件R0至R7所得伽瑪校正 ^參考=^_以等份’傳輸至·轉換器 圖4顯7F伽瑪校正調整電路42之 換以及執行有關妓電流㈣^及ί 區段係連結交換。如圖4上半所示恆定電流 » f源及包括五個恆定電流來源卜2卜仏^ 數。二=ί α⑼加權㈣流,假設11爲正整 號+2(’、n'_n道1'd錄源2(n l)i透過開關+2(n_1)藉控制信 子48。R之―端子及―輸出端 輸入S47導通而連結至電阻^元件R之另—端子及一 :理如圖4下半所示’設置五個恆定電流來源 ^ !及16i,其接地且產生以2⑹)加權的電流2(叫i。 =各電源2叫透過開關+2⑹)藉控制信號+2(n、通 ㈣起電阻器元件R之另-端子及—輪人端子47。怪定 =來源進—步透L2U”)紐靜號_2(η ι) 導=連結至電阻器元件R之—端子及-輸出端子48。 換言之透過開關+2^-^而連結至輸入端子47之恆定電流 來源2(1係作爲圖3B之怪定電流來源44,以及透過= -16. 衣紙張尺度適用中國國家標準(CNS)A4規格(21〇 χ 297公釐) (請先閱讀背面之注意事項再Wir本頁) 本 訂-I line ¥ This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) 503385 A7 B7_ V. Description of the invention (9) Contains the gray-scale display reference voltage generating circuit. (Please read the precautions on the back before writing this page) According to the foregoing structure, the gray-scale display reference voltage generating circuit can adjust each of the multiple reference voltage levels generated by the reference voltage generating circuit based on the adjustment data. Therefore, through externally supplied adjustment data, adjustments are simply made based on the characteristics of the liquid crystal material and the LCD panel without the need to remake the LCD drive sheet 7G. 0 Brief description of the diagram The present invention will be more fully understood from the detailed description and the drawings below, and the detailed description and The drawings are for illustration purposes only and are not restrictive. In the drawings: Circle 1 is a block circle showing the gray-scale display reference voltage generating circuit of the present invention; Figure 2 is a schematic block circle of the country 1 ’s gamma correction adjustment voltage. Figures 3A and 3B are explanations of the operation of a constant current source when obtaining an output voltage higher than the reference voltage and when obtaining an output voltage lower than the reference voltage; Figure 4 is a schematic diagram showing the gamma correction voltage Circuit structure of constant current source sector; Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs; Figure 5 shows the coil display; Figure 1 shows the LCD drive output voltage characteristics of the gray-scale display reference voltage generating circuit; Figure 6 is a block diagram showing the TFT system LCD Fig. 7 is a schematic diagram showing the structure of the LCD panel of Fig. 6; Fig. 8 is a diagram showing an example of LCD driving waveforms; The LCD drive waveform when the pressure is lower than Figure 8; -12- This paper size is applicable to China National Standard (CNS) A4 size ⑽ X 297 mm) 503385 A7 V. Description of invention (10 Printed by the Consumer Cooperative of Intellectual Property Bureau, Ministry of Economic Affairs Fig. 10 is a block country of the source driver of country 6; Fig. 11 is a schematic diagram showing the structure of a gray scale display reference electric generating circuit shown in Fig. 10; and Fig. I2 is a line diagram showing a gray scale display reference voltage generating circuit supported by Fig. 11 An example of the LCD drive output voltage characteristics. Detailed description of the specific embodiment Based on the specific embodiment shown in the drawings, the details of the present invention are described below. Figure 1 is a block diagram showing the grayscale display reference voltage generation of this specific embodiment. Circuit structure. This grayscale display reference ephemeris generating circuit is particularly suitable for LCD #moving circuits of active matrix system LCD devices. It should be noted that LCD devices that have the grayscale display reference voltage generating circuit of the present invention are built in. The structure of the LCD panel, the waveform of the LCD driver, and the structure of the source driver of the LCD panel are all based on the LCD device structure, LCD panel structure, and LCD described with reference to FIGS. 6 to 10. The dynamic waveform and the source driver structure are completely the same, so they will not be described here. The gray-scale display reference voltage generating circuit 41 of this embodiment forms a 64-bit quasi-reference voltage, and generates a conventional gray-scale display similar to that shown in FIG. 11. The intermediate voltage of the reference voltage generating circuit 39. The gray scale display reference voltage generating circuit 41 of this embodiment includes two voltage input terminals of the highest voltage input terminal V0 and the lowest voltage input terminal V64, and eight resistor elements R0 to R7 have resistances. Gamma (γ) correction adjustment circuit 42 is used for the following two steps: Gamma (γ) correction adjustment circuit 42 is used to: Make precise adjustments from resistor elements R0 to R7 to generate I " $ reference voltage, within the specified range, ... Data = :: = -13 This paper is based on the Chinese National Standard (CNS) A4 specification (21G X 297 ^^ 7 * (please read the precautions on the back page first) 装 -ιδτ · 訾-线 503385 A7 V. Invention Explanation (11) locks the adjustment data used by the gamma correction adjustment circuit 42 during the fine adjustment. The resistor 7L pieces R0 to R7 form a reference voltage generating circuit. There are further ^ resistors (not shown in the figure), which are divided into eight groups connected in series to the highest voltage input terminal v0 and output terminal of the uppermost gamma = positive adjustment circuit 42, and the span = interval: output terminals of the mamma correction adjustment circuit 42 And the output terminal and the lowest voltage output terminal v64 across the lowest gamma correction circuit 42. With the foregoing structure, it is not necessary to provide nine gray-scale voltage output terminals v0 to V64. The conventional gray-scale display reference voltage generating circuit 39 is not shown in the figure u. The gray-scale display reference voltage generating circuit 41 generates an intermediate voltage and can be used as shown in Figure 2. Display of gamma correction adjustment circuit for 7F Italy. Ma school, the entire circuit 42 is used by the resistor element R to generate a voltage, a constant current source 44 and 45, and a buffer amplifier 46 sets of voltage caused by the resistor element R flowing through the resistor R, the output voltage: input The voltage is shifted up or down to adjust the mosquito voltage. The gamma correction adjustment circuit 42 constructed as described above operates as follows. / 、 It is printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs: for example, as a reference voltage _ supply gamma code 42 core output terminal ο. When a voltage higher than the reference voltage of the whole house 2 is obtained, a current M :: flowing through the resistor element R is obtained. (Lu) With the lack of current sources 4 4 and 4 5 change, the voltage drop caused by the voltage of R and R is not reduced, and the voltage of the resistor element W is reduced by VGut ^ by inputting the input voltage to the power supply unit; = 4 = in other words The voltage is adjusted by the gamma correction adjustment circuit 42. Therefore, it should be obtained when the paper is -14. This paper size is applicable to China a ^^ (CNS> A4 ϋ— χ Norwegian 503385 A7 B7 V. Description of the invention (12) Intellectual Property Bureau of the Ministry of Economic Affairs The employee consumer cooperative Qiu produced the voltage rVout above the reference voltage Vref to maintain the equation: Vout = Vref + iR and to maintain the equation when the output voltage Vout is below the reference voltage Vref: Vout = Vref-iR when the output voltage Vout is high At the reference voltage Vref (turn 3A) and when the obtained output voltage Vout is lower than the reference voltage Vref (FIG. 3B), the state of the current flowing through the resistor element R is changed by operating the constant current sources 44 and 45. In the above example As shown in circle 3 A, the current i flowing from the constant current source 45 to the constant current source 44 in the forward direction flows through the resistor element R by connecting a constant current source 45 on the side of the output terminal 48 to the current source. .Results as a reference When the voltage Vref is input from the input terminal 47, the output voltage Vout from the output terminal 48 becomes a voltage having the following formula: Vout = Vref + iR This voltage is a voltage drop higher than the reference voltage Vref to the resistor element R. Contrary to the foregoing As shown in FIG. 3B, by connecting the constant current source 44 to the power source and grounding the constant current source 45, the negatively oriented current i flows from the constant current source 44 to the constant current source 45 through the resistor element R. The results are referred to When the voltage Vref is input from the input terminal 47, the output voltage Vout from the output terminal 48 becomes a voltage having the following formula: Vout = Vref-iR This voltage is lower than the reference voltage Vref by the voltage drop of the resistor element R, and then Constant current sources 44 and 15 of the individual gamma correction adjustment circuit 42- This paper size applies the Chinese National Standard (CNS) A4 (210 X 297 mm) Please read the notes at the back first and then page 1 ¾ Order A7 V. Description of the invention (13. For 45, it is printed and exchanged by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs and the exchange between The voltage before and after the data control of the data flash lock circuit 43. For example: = gamma correction obtained by the Γ device elements R0 to R7 ^ reference = ^ _ transmitted to the converter in equal parts' Figure 4 shows the 7F gamma correction adjustment circuit 42 The exchange and execution of the prostituting currents ㈣ ^ and ί are linked exchanges. As shown in the upper half of Fig. 4, the constant current »f source and the five constant current sources are included. Two = ί α⑼Weighted flow, assuming 11 is a positive integer number +2 (', n'_n channel 1'd record source 2 (nl) i through the switch +2 (n_1) to borrow the control letter 48. R of the-terminal and ―The input S47 of the output terminal is turned on and is connected to the other of the resistor ^ element R—the terminal and one: The principle is shown in the lower half of Figure 4. 'Set five constant current sources ^! And 16i, which are grounded and generate a current weighted by 2⑹) 2 (called i. = Each power source 2 is called through the switch + 2⑹) by the control signal +2 (n, through the other-terminal of the resistor element R and-the wheeler terminal 47. Strange = source into-step through L2U ”) Niu Jing _2 (η ι) = =-terminal and-output terminal 48 connected to the resistor element R. In other words, the constant current source 2 (1 series connected to the input terminal 47 through the switch +2 ^-^ As the strange current source 44 in Figure 3B, and the transmission = -16. The size of the paper is applicable to China National Standard (CNS) A4 (21〇χ 297 mm) (Please read the precautions on the back before Wir page) Order-
B 線 503385 經濟部智慧財產局員工消費合作社印製 A7 B7_五、發明說明(14 ) 關連結至輸入端子47之恆定電流來源2(|^4係作爲 圖3A之恆定電流來源44 ;而透過開關+2(η_υ連結至輸出 端子48之恆定電流來源2(η~υί係作爲圖3Α之恒定電流來 源45,以及透過開關-2(η·υ連結至輸出端子48之恆定電流 來源2(η~υί係作爲圖3Β之恆定電流來源45。然後基於調 整資料控制開關+2(1^1》以及開關-2(η·υ的導通及斷開,調整 資料爲由二補數閂鎖於資料閂鎖電路43上所編碼的二進制 位數之多位元數位資料,可達成有關恆定電流來源44及 45之電流値的交換以及介於電源與接地間連結的交換。 使用前述配置,可變更流經電阻器元件R之電流値及方 向,允許藉數步驟向上或向下位移輸入電壓Vin達電壓降 發生於電阻器元件R所得的電壓Vout輸出。後文將以具體 實施例作説明。 後文説明係基於假設調整資料爲6位元資料。基於6位 元表示式調整資料作調整可執行由-32至+ 31的64步驟的 伽瑪校正値的調整。 參照圖4,恆定電流來源i、2i、4i、8i及16 i產生以 2(η·υ加權的電流i、2i、4i、8i及16i。開關+2(n-1)以及開 關係基於資料閂鎖電路43輸入的6位元調整資料而 被導通或斷開。基於6位元調整資料之伽瑪校正調整電路 42之操作容後詳述。 至於第一例,係參考調整資料爲” + 1 : (000001)"之案 例。本例中僅二開關+2G被導通,而所有其他開關皆斷開。 此種狀態同圖3A之狀態。換言之流經電阻器元件R之電 -17- 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) (請先閱讀背面之注音?事項再 I 0 i MMml 本頁) 訂· 線 503385 經濟部智慧財產局員工消費合作社印製 A7 B7_五、發明說明(15) 流Ϊ total係等於恆定電流來源i之恆定電流i以及電流方向 如前文說明為正向。因此輸出電壓:Vout由輸入的參考電墨 Vin提昇達發生於電阻器元件R的電壓降,結果獲得以方 程式 Vout= Vin+i x R 表示的輸出電壓。此乃高於輸入參考電壓Vin達(i x R)之 電壓。 至於另一例,係參考調整資料為"-9 : (100111)”。此例 中二開關-23二開關-2。共四個開關被導通,而所有其他開 關皆被斷開,此種狀態同圖3B之狀態。換言之流經電阻器 元件R之電流It0tai變成恨定電流i及恒·定電流8i之和的 9i,以及電流方向如前述為負向。因此輸出電壓Vout由輸 入的參考電壓Vin降低達發生於電阻器元件R的電壓降, 結果獲得以方程式 Vout= Vin-9i x R 表示的輸出電壓。此乃低於輸入參考電壓Vin達(i x R)值 九倍之電壓。 於其他調整資料案例,根據前述操作經由導通或斷開開 關+2(.1)以及麵2(n“),電壓調整可以由糖32至+ 31之64個 步騾執行,每一步驟之電壓(i X R)係對中於輸入的參考電 壓 Vin。 換言之經由使用以二的補數表示式編碼的二進制位數之 多位元數位資料作為調整資料,流經電阻器元件R之值之 位元數η及權值(幅度)2(η·υ可變成透過開關以及- -18- <請先閱讀背面之注音S事項再Line B 503385 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7_V. Description of the invention (14) The constant current source 2 (| ^ 4 is connected to the constant current source 44 of Figure 3A; and Switch +2 (η_υ constant current source 2 connected to output terminal 48 (η ~ υί is used as a constant current source 45 of FIG. 3A, and through switch-2 (η · υ constant current source 2 connected to output terminal 48 (η ~ υί is used as the constant current source 45 in Figure 3B. Then, based on the adjustment data, the switch +2 (1 ^ 1 "and switch -2 (η · υ are turned on and off. The adjustment data is latched to the data by two's complement numbers. The multi-bit digital data of the binary digits encoded on the latch circuit 43 can achieve the exchange of the current 値 of the constant current sources 44 and 45 and the connection between the power source and the ground. Using the foregoing configuration, the current can be changed Through the current and direction of the resistor element R, it is allowed to shift the input voltage Vin up or down in a few steps to reach the voltage Vout output generated by the resistor element R. The specific embodiment will be described later. Description System The assumption is that the adjustment data is 6-bit data. Based on the 6-bit expression adjustment data, the 64-step gamma correction 値 adjustment from -32 to + 31 can be performed. Referring to Figure 4, the constant current sources i, 2i, 4i, 8i, and 16 i generate currents i, 2i, 4i, 8i, and 16i weighted by 2 (η · υ. Switch +2 (n-1) and open relationship adjust data based on 6 bits input from data latch circuit 43 It is turned on or off. The operation of the gamma correction adjustment circuit 42 based on the 6-bit adjustment data is described in detail later. As for the first example, it is a case where the adjustment data is "+ 1: (000001)". This In the example, only two switches + 2G are turned on, and all other switches are turned off. This state is the same as the state of Figure 3A. In other words, the electricity flowing through the resistor element R-17-This paper standard applies to China National Standard (CNS) A4 Specifications (210 X 297 mm) (Please read the note on the back? Matters then I 0 i MMml on this page) Order · Line 503385 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7_V. Invention Description (15) Stream Ϊ total is equal to the constant current i and the current direction of the constant current source i as described above. Therefore, the output voltage: Vout is increased by the input reference electro-ink Vin to the voltage drop occurring in the resistor element R, and the output voltage obtained by the equation Vout = Vin + ix R is obtained. This is higher than the input reference voltage Vin up to ( ix R) voltage. For another example, the reference adjustment data is " -9: (100111) ". In this example, two switches-23 two switches-2. A total of four switches are turned on, and all other switches are turned on. This state is the same as the state shown in FIG. 3B. In other words, the current It0tai flowing through the resistor element R becomes 9i, which is the sum of the constant current i and the constant and constant current 8i, and the current direction is negative as described above. Therefore, the output voltage Vout is reduced from the input reference voltage Vin to the voltage drop occurring at the resistor element R, and as a result, an output voltage expressed by the equation Vout = Vin-9i x R is obtained. This is a voltage that is nine times lower than the input reference voltage Vin (i x R). In other cases of adjusting data, according to the foregoing operation, by turning on or off the switch +2 (.1) and surface 2 (n "), the voltage adjustment can be performed in 64 steps of sugar 32 to + 31, the voltage of each step (I XR) is the reference voltage Vin that is centered on the input. In other words, by using the multi-bit digital data of binary digits coded in two's complement expression as the adjustment data, the bit of the value of the resistor element R flowing through The number η and the weight (amplitude) 2 (η · υ can be changed through the switch and--18- < Please read the note S on the back before
訂·Order ·
本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) A7 五、發明說明(1e) 經濟部智慧財產局員工消費合作社印製This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) A7 V. Description of Invention (1e) Printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs
2(ί1 υ彼此對應。因此可 / 之調整資料之調整幅度:。于於得自資料閂鎖電路43 參考值調整量。 Υ換0之可藉調整資料單純指定 如此經由根據來自資料网鎖斷開開關+2(η])以及_2(ttel) ' , $碉整資料而導通及電壓所得電壓經由基於電阻二:出=調整資料調整輸入至伽瑪校正討基於取中城 ^施加此項調整 元件七人 戶〗登貧枓,基於電阻器 如圖5所示。 “下變更LCD驅動輪iii電壓特徵, 需注意調整資料之寫入資料問鎖電路幻 顯示資料D之輸人端予與取自顯 ^讀使用正系 過例如-輸人_電路,—、,脈信號同步透 -位=位移器電路(參考_⑼—維持記憶體及 動=:3: =例中,供給參考電壓對源極堪 括伽瑪校正調整電路42的灰T參考電恩產生電路41包 之調整資料儲存於資科_電路43R7,向上Μ下^ 校正電阻比之電阻器元件R〇至 勹上或向下碉整參考電壓Vref❹ 此種伽瑪校正調整電路42之構造如下。、定電流來源2㈣i連結至電源以及產生以2(;二二恆 ,於妓4正整數),該五節定電流二)=控制信號+2㈣導通而連結至電阻器元件R以及輸出端 f 48 ,以及透過開關ju-u由控制信號_2(η·υ s ^„ 導通而連結至电阻器元件R以及輸入端子4卜同理,五個接地且產生 19 本紙張尺度賴t國國家標準(CNS)A4規格(21G x 297公髮) (請先閲讀背面之注意事項再填寫本頁)2 (ί1 υ correspond to each other. Therefore, the adjustment range of the data can be adjusted: Yu Yu obtained from the data latch circuit 43 reference value adjustment amount. For 0, the adjustment data can be simply specified so that it can be locked by the data network. Open the switch +2 (η)) and _2 (ttel) ', $ 碉 The data is turned on and the voltage is obtained. The voltage is obtained based on the resistance two: output = adjust the data to adjust the input to the gamma correction. Seven-person households with adjustment elements are poor, based on the resistor as shown in Figure 5. "To change the voltage characteristics of the LCD drive wheel iii, you need to pay attention to the adjustment of the written data and the lock circuit. Taken from the display ^ read using the positive system, such as-input people _ circuit,-,, pulse signal synchronization through-bit = shifter circuit (reference _ ⑼-maintain memory and motion =: 3 :: In the example, supply the reference voltage The adjustment data for the gray T reference circuit of the source correction circuit 42 including the gamma correction adjustment circuit 41 is stored in the asset_circuit 43R7, and upwards and downwards ^ The resistor element R0 for correcting the resistance ratio is upward or downward. Lower correction reference voltage Vref❹ This gamma correction adjustment circuit 42 The structure is as follows. The constant current source 2㈣i is connected to the power supply and generates 2 (; two two constants, 4 positive integers in the prostitute), the five sections of constant current two) = control signal + 2㈣ is connected and connected to the resistor element R and the output The terminal f 48 is connected to the resistor element R and the input terminal 4 through the control signal _2 (η · υ s ^ „through the switch ju-u. The same principle applies to the five grounds and 19 paper standards. (CNS) A4 specification (21G x 297) (Please read the precautions on the back before filling this page)
-n n ϋ I --訂— 線. 503385 A7 B7 五、發明說明(17) 經濟部智慧財產局員工消費合作社印製 以2(n-u加權的電流的恒定電流源2(n-ui係透過開 關+2(n_u由控制信號導通而連結至電阻器元件R以 及輸入端子47以及透過開關-2(n-u由控制信號-2(n-1》導通 而連結至電阻器元件R以及輸出端子48。 因此,基於來自資料閂鎖電路43的6位元調整資料而控 制開關+2(Ι^υ及-2(η_υ的導通或斷開,流經電阻器元件R的 電流值及電流方向的組合可以64種方式切換及設定。換言 之,已經進行電阻器元件R0至R7之伽瑪校正的各個參考 電壓Vref共可於64個階調整包括3 1個向上階以及32個 向下階。 換言之,根據本具體實施例,例如經由將調整資料加至 顯示資料以及利用顯示資料D的輸入端子將調整資料窝入 資料閂鎖電路43,可單純改變伽瑪校正特徵。如此免除需 要根據液晶材料以及LCD面板特徵變更電源驅動器的設 計,允許提供一種電源驅動器其可因應所有此等情況的變 化而無需重新製造LSI’s(大型積體電路)。 前述例中,參考灰階顯示參考電壓產生電路41藉電阻器 元件R0至R7及伽瑪校正調整電路42產生所需中間電 壓,因此例如無須由外部供給九個位準灰階參考電壓。因 此經由僅對外部接收的灰階參考電壓提供最高電壓輸入端 子V0以及最低電壓輸入端子V64做二輸入端子,可減少 外部電路規模及端子數ϋ。如此外部電路規模及端子數目 的減少允許降低製造成本。 如前述,調整資料可隨時窝入設置於來源驅動器内侧的 -20 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐) 請 先 閱 讀 背 之 注 意 項 再 訂-nn ϋ I-order-line. 503385 A7 B7 V. Description of the invention (17) Constant current source 2 (nu-ui series through switch + 2 (n_u is connected by the control signal to the resistor element R and the input terminal 47, and is connected to the resistor element R and the output terminal 48 by the switch-2 (nu is turned on by the control signal-2 (n-1 "). Therefore, Based on the 6-bit adjustment data from the data latch circuit 43, the switches +2 (Ι ^ υ and -2 (η_υ) are turned on or off, and the combination of the current value and current direction flowing through the resistor element R can be 64 kinds Mode switching and setting. In other words, each reference voltage Vref that has been gamma-corrected for the resistor elements R0 to R7 can be adjusted in 64 steps in total, including 31 upward steps and 32 downward steps. In other words, according to this specific implementation For example, by adding adjustment data to the display data and embedding the adjustment data into the data latch circuit 43 by using the input terminal of the display data D, the gamma correction characteristic can be simply changed. This eliminates the need to change according to the characteristics of the liquid crystal material and the LCD panel The design of the power driver allows to provide a power driver that can respond to all these changes without having to remanufacture LSI's (Large Integrated Circuits). In the foregoing example, the reference gray-scale display reference voltage generating circuit 41 borrows resistor elements R0 to R7 and the gamma correction adjustment circuit 42 generate the required intermediate voltage, so for example, there is no need to supply nine-level grayscale reference voltages from the outside. Therefore, the highest voltage input terminal V0 and the lowest voltage input are provided only for the grayscale reference voltages received externally. The terminal V64 can be used as a two-input terminal, which can reduce the size of the external circuit and the number of terminals. In this way, the reduction in the size of the external circuit and the number of terminals allows the manufacturing cost to be reduced. The dimensions are applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm). Please read the notes on the back before ordering
503385 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明說明(18) 貝料閂鎖電路43。因此可修正每個LCD模組產生的灰階 顯示之量產變異。此外,調整資料也可窝至lcD面板之每 水平線。因此經由修正水平陰影或Lcd面板之顯示瑕疵 可達成較高品質的顯示。 則逑具體實施例係提供以五個第一恆定電流源2(n_Ui連 結至電源,五個開關+2(η-υ用以連結第一恆定電流源至電 阻器元件R〇至R7以及輸出端子48,五個開關_2(η])用以 連結第一恆定電流源至電阻器元件R()至R7以及輸入端子 47 ’五個接地第二恆定電流源_2(心1:^,五個開關+2(η-υ用 以連結第二恆定電流源至電阻器元件R以及輸入端子47, 以及五個開關-2(n-1》用以連結第二恆定電流源至電阻器元件 R以及輸出端子48 «開關+2(η·!)及-2(η·υ係基於6位元調 整資料導通及斷開,以64階調整各伽瑪校正參考電壓 Vref^但恆定電流源及開關數目以及調整資料的位元數當 然非僅限於前述數值。 此外,由恆定電流源產生的電流值的加權非僅限於 2(η〃》,反而可經由將液晶材料,LCD面板特徵以及灰階顯 示器之量產變異列入考慮而予適當設定β 前文說明顯然易知,本發明之灰階顯示參考電壓產生電 路可基於外部調整資料,藉調整電路調整由參考電壓產生 電路的多位準參考電壓❹因此即使於LCD驅動單元安裝於 灰階顯示參考電壓產生電路後,根據液晶材料以及LCD面 板特徵可藉外部供給調整資料單純調整參考電壓而無需重 新製造LCD驅動單元。 -21 - 本紙張尺度適用中國國家標準(CNS)A4規袼(21〇 X 297公釐) (請先閱讀背面之注意事項再填寫本頁) 訂:503385 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (18) Shell latch circuit 43. Therefore, the production variation of the grayscale display produced by each LCD module can be corrected. In addition, adjustment data can also be nested to each horizontal line of the LCD panel. Therefore, by correcting the horizontal shading or the display defects of the LCD panel, a higher quality display can be achieved. Then, the specific embodiment provides five first constant current sources 2 (n_Ui connected to the power supply, five switches +2 (η-υ to connect the first constant current source to the resistor elements R0 to R7 and the output terminals 48, five switches_2 (η)) are used to connect the first constant current source to the resistor elements R () to R7 and the input terminal 47 'five grounded second constant current sources_2 (heart 1: ^, five Switches +2 (η-υ are used to connect the second constant current source to the resistor element R and the input terminal 47, and five switches -2 (n-1 "are used to connect the second constant current source to the resistor element R And output terminal 48 «Switch +2 (η ·!) And -2 (η · υ are turned on and off based on 6-bit adjustment data, and each gamma correction reference voltage Vref ^ is adjusted in 64 steps, but the constant current source and switch The number and the number of bits of adjustment data are of course not limited to the aforementioned values. In addition, the weighting of the current value generated by the constant current source is not limited to 2 (η〃 ", but can be obtained by combining the liquid crystal material, LCD panel characteristics, and grayscale display. The mass production variation is taken into consideration and β is appropriately set. The foregoing description is obviously easy to understand. The display reference voltage generating circuit can adjust the multi-level reference voltage by the reference voltage generating circuit based on the external adjustment data. Therefore, even after the LCD driving unit is installed in the gray scale display reference voltage generating circuit, Features You can simply adjust the reference voltage without remanufacturing the LCD drive unit by using externally supplied adjustment data. -21-This paper size applies Chinese National Standard (CNS) A4 Regulations (21 × X 297 mm) (Please read the note on the back first Please fill in this page for matters)
503385 A7 _._B7_ 五、發明說明(19) 此外,經由隨時提供調整資料,可修正安裝有灰階顯示 參考電壓產生電路之灰階顯示產生的每個LCD模组之量產 變異。此外,預定中間電壓係於參考電壓產生電路以及調 整電路於内部產生,因此無須由外部供給三或三以上的位 準灰階參考電壓。因此可減少外部電路規模及端子數目, 允許降低製造成本。 根據一具體實施例之灰階顯示參考電壓產生電路,調整 電路包括參考電壓之輸入端子,調整資料之輸入端子,調 整後電壓之輸出端子,以及調整後電壓產生電路,其根據 調整資料產生比參考電壓更高或更低的電壓且輸出結果所 得電壓作為調整後的電壓◎使用此種配置,根據調整資料 調整後的電壓容易基於參考電壓而產生且由輸出端子輸 出。 根據一具體實施例之灰階顯示參考電壓產生電路,調整 後的電壓產生電路係由電位差產生電路(用以根據調整資料 產電位差)以及和電壓輸出電路(用以輸出參考電壓與電位差 之和電壓)組成。使用此種配置,可單純形成調整後的電壓 產生電路。 經濟部智慧財產局員工消費合作社印製 根據一具體實施例之灰階顯示參考電壓產生電路,調整 後的電壓產生電路係由電阻器元件設置於輸入端子與輸出 端子間,恆定電流源及開關元件组成,開關元件係插置於 恆定電流源與電阻器元件間且係基於調整資料而被導通與 斷開◎使用此種配置,流經電阻器元件之電流值可經由基 於調整資料控制各開關元件的導通與斷開而予改變,允許 •22- 本紙張尺度適用中國國家標準(CNS)A4規袼(210 X 297公釐) 503385 A7 B7 五、發明說明(20) 經濟部智慧財產局員工消費合作社印製 控制跨二端之間的電位差。因此可根據調整資料調整參考 電壓達調整量。 一具體實施例之灰階顯示參考電壓產生電路包括缓衝放 大器插置至於電阻器元件與輸出端子間。使用此種配置, 輸出電流可以較低輸出阻抗由輸出端子穩定送出。 根據一具體實施例之灰階顯示參考電壓產生電路,恆定 電流源產生以2(n_1》加權的電流,假設η為正整數,以及調 整資料為以二的補數形式表示的二進制位數的多位元數位 資料。使用此種配置,調整資料以及恆定電流源之權值可 變成彼此對應,而調整資料之位元數可設定為η。因此對應 於調整資料之乘數電位差可跨電阻器元件而產生。 換言之,根據本具體實施例,參考電壓之調整量可單純 藉調整資料指定。此外,經由將調整資料加至顯示資料, 經由調整LCD面板每一水平線之灰階顯示的參考電壓以及 修正水平陰影或LCD面板之一顯示瑕疵可獲得較高品質的 顯示。 根據一具體實施例之灰階顯示參考電壓產生電路,恆定 電流源係由第一恆定電流源(供電流流入電阻器元件)以及第 二恆定電流源(供電流流出電阻器元件)組成;將電流流入電 阻器元件的第一恆定電流源以及將電流流出電阻器元件之 第二恆定電流源係藉開關元件操作。使用此種配置,可根 據調整資料設定調整量以及參考電壓的增減。 根據一具體實施例之灰階顯示參考電壓產生電路,參考 電壓產生電路產生伽瑪校正後的參考電壓;以及調整電路 -23- 本紙張尺度適用中國國家標準(CNS)A4規袼(210 X 297公釐) 請 先 閱 讀 背 之 注 意 事 項 m i 訂 線 503385 A7 B7___ 五、發明說明(21 ) (請先閱讀背面之注意事項再本頁) 為調整伽瑪校正後的參考電壓之伽瑪校正調整電路。因此 伽瑪校正後的參考電壓可進一步根據液晶材料以及LCD面 板特徵作調整。如此允許產生根據液晶材料以及LCD面板 特徵更為正確調整的參考電壓。 根據本發明之第二特徵方面之LCD驅動單元包括灰階顯 示參考電壓產生電路,其可基於調整資料而調整多位準所 產生的參考電壓。使用此種配置,由外部供給調整資料, 可單純根據液晶材料以及LCD面板特徵調整參考電壓而無 需重新製造LCD驅動單元。 如此說明本發明,顯然易知可以多種方式作變化◎此等 變化不可视為悖離本發明之精髓及範園,所有業界人士顯 然易知的此等修改意圈皆含括於如下申請專利範圍之範 參考編號 41 :灰階顯示參考電壓產生電路 4 2 ·伽瑪权正調整電路 43 :資料閂鎖電路 44,45,i,2i,4i,gi,16i :恆定電流源 46 :缓衝放大器 經濟部智慧財產局員工消費合作社印製 VO :最高電壓輸入端子 V64 :最低電壓輸入端子 R0-R7,R :電阻器元件 + 2(n-l),_2(n-l):開關 • 24- 本紙張尺度適用中國國家標準(CNS)A4規格(210 X 297公釐)503385 A7 _._ B7_ V. Description of the invention (19) In addition, by providing adjustment data at any time, the mass production variation of each LCD module generated by the gray-scale display installed with the gray-scale display reference voltage generating circuit can be corrected. In addition, the predetermined intermediate voltage is generated in the reference voltage generation circuit and the adjustment circuit is generated internally, so it is not necessary to supply three or more levels of grayscale reference voltage from the outside. Therefore, the scale of the external circuit and the number of terminals can be reduced, allowing the manufacturing cost to be reduced. According to a specific embodiment, a gray-scale display reference voltage generating circuit includes an adjustment circuit including an input terminal of a reference voltage, an input terminal of an adjustment data, an output terminal of an adjusted voltage, and an adjusted voltage generation circuit. The voltage higher or lower and the output voltage is used as the adjusted voltage. ◎ With this configuration, the adjusted voltage based on the adjustment data is easily generated based on the reference voltage and output by the output terminal. According to a specific embodiment of the gray-scale display reference voltage generating circuit, the adjusted voltage generating circuit is composed of a potential difference generating circuit (for generating a potential difference according to adjustment data) and a voltage output circuit (for outputting a sum of a reference voltage and a potential difference). )composition. With this configuration, an adjusted voltage generating circuit can be simply formed. Printed by a consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, a gray-scale display reference voltage generating circuit according to a specific embodiment. The adjusted voltage generating circuit is provided by a resistor element between an input terminal and an output terminal, a constant current source and a switching element. The switching element is inserted between the constant current source and the resistor element and is turned on and off based on the adjustment data. ◎ With this configuration, the value of the current flowing through the resistor element can be controlled by the adjustment data based on the adjustment data. The continuity and disconnection are subject to change, allowing • 22- This paper size applies the Chinese National Standard (CNS) A4 Regulations (210 X 297 mm) 503385 A7 B7 V. Description of Invention (20) Employees ’Consumption of Intellectual Property, Ministry of Economic Affairs The cooperative prints the potential difference between the two terminals. Therefore, the reference voltage can be adjusted up to the adjustment amount according to the adjustment data. A specific embodiment of the gray-scale display reference voltage generating circuit includes a buffer amplifier interposed between the resistor element and the output terminal. With this configuration, the output current can be stably sent from the output terminal with a lower output impedance. According to a specific embodiment of the gray-scale display reference voltage generating circuit, a constant current source generates a current weighted by 2 (n_1 ", assuming that η is a positive integer, and adjusting the data to a number of binary digits represented in two's complement form. Bit digital data. With this configuration, the weight of the adjustment data and the constant current source can become corresponding to each other, and the number of bits of the adjustment data can be set to η. Therefore, the multiplier potential difference corresponding to the adjustment data can be across the resistor element In other words, according to this specific embodiment, the adjustment amount of the reference voltage can be specified solely by adjustment data. In addition, by adding the adjustment data to the display data, by adjusting the reference voltage and correction of the gray scale display of each horizontal line of the LCD panel According to a specific embodiment of the gray-scale display reference voltage generating circuit, a constant current source is a first constant current source (for current to flow into a resistor element) and Composed of a second constant current source (for the current to flow out of the resistor element); the current flows into the resistor element The first constant current source and the second constant current source that flows current out of the resistor element are operated by the switching element. With this configuration, the adjustment amount and the reference voltage can be increased or decreased according to the adjustment data. According to a specific embodiment, Gray scale display reference voltage generation circuit, the reference voltage generation circuit generates the gamma-corrected reference voltage; and the adjustment circuit-23- This paper size applies the Chinese National Standard (CNS) A4 Regulation (210 X 297 mm) Please read first Notes on the back mi 503385 A7 B7___ V. Description of the invention (21) (Please read the notes on the back before this page) The gamma correction adjustment circuit for adjusting the reference voltage after gamma correction. Therefore, after gamma correction The reference voltage can be further adjusted according to the characteristics of the liquid crystal material and the LCD panel. This allows a reference voltage to be more accurately adjusted according to the characteristics of the liquid crystal material and the LCD panel. The LCD driving unit according to the second characteristic aspect of the present invention includes a grayscale display reference Voltage generating circuit, which can adjust the reference voltage generated by multiple levels based on the adjustment data With this configuration, externally supplied adjustment data can adjust the reference voltage based solely on the characteristics of the liquid crystal material and the LCD panel without remanufacturing the LCD drive unit. As the invention is explained in this way, it is obvious that changes can be made in various ways. ◎ These changes It cannot be regarded as contrary to the essence of the present invention and the fan garden. All the people in the industry clearly know that these modified circles are included in the following patent application scope. Reference number 41: Gray scale display reference voltage generating circuit 4 2 · Gamma Ma Quanzheng adjusting circuit 43: data latch circuits 44, 45, i, 2i, 4i, gi, 16i: constant current source 46: buffer amplifier, printed by employee consumer cooperative of Intellectual Property Bureau, Ministry of Economic Affairs, VO: highest voltage input terminal V64 : Lowest voltage input terminals R0-R7, R: Resistor element + 2 (nl), _2 (nl): Switch • 24- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)
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JP35145999A JP3495960B2 (en) | 1999-12-10 | 1999-12-10 | Gray scale display reference voltage generating circuit and liquid crystal driving device using the same |
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1999
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-
2000
- 2000-12-08 US US09/731,736 patent/US6437716B2/en not_active Expired - Lifetime
- 2000-12-08 TW TW089126226A patent/TW503385B/en not_active IP Right Cessation
- 2000-12-11 KR KR10-2000-0075187A patent/KR100375309B1/en not_active IP Right Cessation
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TWI457907B (en) * | 2011-08-05 | 2014-10-21 | Novatek Microelectronics Corp | Driving apparatus for display and driving method thereof |
Also Published As
Publication number | Publication date |
---|---|
JP3495960B2 (en) | 2004-02-09 |
US20010003431A1 (en) | 2001-06-14 |
KR20010062324A (en) | 2001-07-07 |
US6437716B2 (en) | 2002-08-20 |
JP2001166751A (en) | 2001-06-22 |
KR100375309B1 (en) | 2003-03-10 |
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